#include<iostream>
#include<cstring>
using namespace std;
int main()
{
    char A[]="AAAAA";
    char B[]="BBBB";
    const char *p;
    p=A;
    cout<<*p<<endl;
    //*p="bbbb";
    p=B;
    cout<<*p<<endl;
    cout<<strlen("\0")<<'\t'<<sizeof("\0")<<endl;
    return 0;
}